This is an advanced but highly effective fix. The dt18.cpk file controls in-game ball physics and crowd rendering. Download a "Performance" version of dt18.cpk (specifically for low-end PCs). These modded files:
If you are still experiencing lag, follow this final checklist: fix lag pes 2019 pc low-end
C:\Program Files (x86)\Steam\steamapps\common\Pro Evolution Soccer 2019).Data folder.dt36.cpk.dt36.cpk.BACKUP (never delete; keep a backup).